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Zur Kristallstruktur von Ce<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub> / On the Crystal Structure of Ce<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>
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1995
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Materials ScienceInorganic ChemistryCrystal StructureEngineeringPhysicsCrystal MaterialCe 2Natural SciencesCondensed Matter PhysicsStructure ElucidationChemistryInorganic MaterialCrystallographyCrystal Structure DesignWo 4
Single crystals of Ce 2 (WO 4 ) 3 have been prepared by crystallisation from molten mixtures of WO 3 and CeO 2 . The compound shows monoclinic symmetry, a = 7.813(4), b = 11.720(2), c = 11.586(3), β = 109.36(3)°, Z = 4, and is isotypic to Eu 2 (WO 4 ) 3 , but shows large differences of the atomic coordinates especially of oxygen. The crystal structure of Ce 2 (WO 4 ) 3 is characterized by W(1)O 4 tetrahedra, square W(2)O 5 pyramids and a distorted capped trigonal prism of oxygen around cerium. The decrease of the oxidation states of Ce 4+ or W 6+ was proved by thermogravimetric and magnetic measurements as well as by calculations of the Coulomb terms of lattice energy.